In some ways cyclists are slow enough compared to how fast a car can accelerate. Even a moped or motorcycle can use speed assert its presence and maintain safe stopping distance between other cars.

Especially in a urban area where everyone is stuck trying to get to home/work/etc, most cars appear to be looking for opportunities. Opportunities to get ahead, to squeeze through a left turn lane before oncoming traffic, to find an empty bike lane to drop off an uber eats order. With that opportunity, get ahead” mindset, cyclists do not register. Until, of course, something happens.